const fp = require("lodash/fp");

const cars = [
    {
        name: "Ferrari FF",
        horsepower: 660,
        dollar_value: 700000,
        in_stock: true
    },
    {
        name: "Spyker C12 Zagato",
        horsepower: 650,
        dollar_value: 648000,
        in_stock: false
    },
    {
        name: "Jaguar XKR-S",
        horsepower: 550,
        dollar_value: 132000,
        in_stock: false
    },
    {
        name: "Audi R8",
        horsepower: 525,
        dollar_value: 114200,
        in_stock: false
    },
    {
        name: "Aston Matin One-77",
        horsepower: 750,
        dollar_value: 1850000,
        in_stock: true
    },
    {
        name: "Pagani Huayra",
        horsepower: 700,
        dollar_value: 1300000,
        in_stock: false
    }
];

const fn_1 = fp.flowRight(fp.prop("in_stock"), fp.last);

console.log(fn_1(cars));

const fn_2 = fp.flowRight(fp.prop("name"), fp.first);

console.log(fn_2(cars));



let _average = function (xs) {
    return fp.reduce(fp.add, 0, xs) / xs.length;
}

let averageDollarValue = function (cars) {
    let dollar_values = fp.map(function (cars) {
        return cars.dollar_value;
    }, cars);
    return _average(dollar_values)
}

// console.log(averageDollarValue(cars));


const middle_fn = cars => cars.dollar_value
averageDollarValue = fp.flowRight(_average, fp.map(middle_fn));
console.log(averageDollarValue(cars));

let _underscore = fp.replace(/\W+/g, "_");

const sanitizeNames = (list) => {
    return fp.flowRight(fp.split(","), fp.toLower, fp.map(_underscore))(list);
}


console.log(sanitizeNames(["Hello World"]));
